ĐÁNH GIÁ TÁC ĐỘNG CỦA KHU VỰC HẠ LƯU THỦY ĐIỆN BẢN VẼ KHI XẢ LŨ THIẾT KẾ CÓ QUAN TÂM ĐẾN ẢNH HƯỞNG CỦA CÔNG TRÌNH THỦY ĐIỆN NẬM NƠN

Abstract

Song Ca is a river full of hydroelectric power potential in Vietnam, in which a lot of cascade systems of hydroelectric power stations have been constructed and under construction. Flood releasing in the upstream reservoirs has significant impacts on the downstream ones. This matter needs to be assessed in detail to find a solution. In this study, the authors presented the result of flood level calculation in the downstream of Ban Ve hydropower when releasing flood, considering the impacts of Nam Non hydropower. One-dimension and two-dimension hydraulic models along with Mike Flood were used to simulate hydrodynamic process combining with GIS tool to assess the impacts of flood. The result of the study indicated that the water level in the scenario of Ban Ve reservoir releasing 0.5% design flood did not cause inundation for residential areas in the upstream, meanwhile in case of releasing 0.02% design flood, the water level did not exceed the elevation of dam top level. These quantitative results would help the decision makers have reasonable mitigation plans.